Vibrating screen



juy 8 1924., 1,566,856

T. D. WALSH VIBRATING SCREEN Filed Feb. `5, 192.1 2 sheets-sheet 1zgfmfolfy. Wala,

July 8, 1924;. 1,500,856

T. D. WALSH VIBRATING SCREEN Filed Feb. 5, 1921 2 Sheets-.Sheet 2 @N f2I V1 B .I Patented July 8, 19124.

TES

Lasse TIMOTHY D. WALSH, 01E LOS ANGELES, CALIFORNIA. i

VIBRATING SCREEN.

Application filed February 5, 1921. Serial No. 442,728.

T o all whom t may concern:

Be it known that I, TIMOTHY D. WALSH, a citizen of the United States,residing at Los Angeles, in the countyl of Los Angeles and State ofCalifornia, have invented a new and useful Vibrating Screen, of whichthe following is a specification.

This invention re-lates to apparatus for .sizing by' gravity, granularmaterial such as rock, gravel, coal, ore, etc. Y

n carrying out this invention I have made provision Jfor oscillating ascreen on an axis at a high rate of vibration With a yielding stop atone side and a bumping stop at the other side of the oscillation; and itis necessary in carrying out the invention that the structure of thescreen shall be very strong and capable of sustaining rapid and severeshocks and vibrations continuously for. long periods of time;

and also that an automatic take-up be provided for tightening the -wirecloth or other screen surface from time to time to correctfthe tendencyof the same to sag 'under the load and strain' placed upon it.

An object of this invention is to produce a comparatively cheap andsimple screening apparatus of this character adapted to be readilyadjusted to suit various requirements.

An object is to provide for ready and quick removal of worn'out screensurfaces and replacement of the same with new.

Another object isto readily change the angle of inclination of thescreen to sult diierent classes of material.

In carrying out this invention I employ an unbalanced rotor operating onan o scillating screen, and for convenience 1n changing the screens orthe wire cloth or other screenA material, the screen frame is detachablymounted on a frame oscillating on a pivotal axis and arranged to yieldinly hold the screen aslant with the unba anced rotor at the upper end.

Other'objects, advantages and features of invention may appear from theaccompanying drawings, the subjoined deta1l description and the appendedclaims.

The accompanying drawings illustrate the invention.

Figure 1 is a side elevation of the sizing apparatus constructed inaccordance with this invention.

Fig. 2 is a view .perpendicular to the plane of the screen furtherillustrating the apparatus shown in Fig. 1; omitting portions of thescreen surface.

' Fig. 3 is an end view of said apparatus in a plane perpendicular tothe yielding su port shown in Fig. 1.

ig. 4 is a fragmental detail in `section on .line w, Fig. 2.

Fig. 5 isan isometric projection of the vibrating frame detached withrotor in place.

j Fig. 6 is an isometric projection of the screen frame detached.k

The support 1 may be concrete piers or heavy timbers or any character ofconstruction adapted to withstand the vibratory strain of the apparatus.

The vibrating frame is shown as constructed of the4 side members 2, thecross members 3, the aXis 4 ,and the yoke 5, all rigidly xed together asby bolting or welding, and Shaft 6 rigidly fixed in place by nuts 7, 8.

The axis 4 of the frame is journalled by bearings 9 tothe support 1.The-axis 4 and yoke 5 are widely separated.

The rotor is shown in the form of a pulley 10, mounted on the shaft 6,and unbalanced in a suitable manner as indicated by the eccentric weight11; and driven by any suitable means as by the belt 12 which maybeconnected to a high speed motor or other suitable driving means.

The screen is Imounted upon Athe frame members 2 and comprises twolongitudinally grooved side rails 13 upon which is applied screenmaterial 14 that may be wire cloth or other material of any desiredcharacter adapted to be used for sizing. Said screen material isdepressed into the longitudinal grooves 15 which are on the top surfaceof the side rails and is 'secured `in place by means of clinchers 16clamped to the rails by angle irons 17 and carriage bolts 18. Said angleirons 17 'have their flanges 19 adjacent to the screening surface 14between7 the rails, and may serve, as, or as supports for, side boardsfor the screen. 4

The rails 13 are mounted in laterally adjustable relation to each otherby means of adjusting rods 20 inserted into seats formed by holes 21 inthe rails 13, which rails are yieldingly held apart by cooperation ofthe tension stop formed by a nut 22 engaging one of the rails 13, and atension spring 23 operating between the other rail and a tension stopformed by the nut 24 on the adjustin rod 20.

Sai stops 22 and 24 are threaded to the rod and are adjustable thereonto increase or relieve the tension of the screen. The tension of thescreen surface 14 is maintained at any desired degree of stretch ortautness by screwing the nuts 24 along the adjusting rods 20.

The screen frame is xed to the oscillating frame by pointed set screws25 screwed through brackets 26 fixed to and extending upward from theoscillating frame above the side members thereof, and against the angleirons 17 and are lixed in place by the jam nuts 27. When the set screws25 atone or both edges of the screen are unscrewed, the springs 23spread the rails 13 apart thus tightening the screen surface. Theadjusting rods 20 extending through the holes 21, hold the rails in trueposition. The oscillating frame and the screen slope downward from therotor toward the pivotal axis 4f.

The rotor end of the frame is supported by a pillar 28 having adjustablestops formed by the nuts 29 and 30, said pillar extends through the yoke5 which is resiliently supported by a spring 31 surrounding the pillarand resting on the lowerstop 29 and adapted to yieldingly drive and holdthe cross-bar of the yoke up against' the upper stop 30. A cushion 32 ispreferably interposed between the upper stop 30 and the yoke. The pillaris held rigidly to the foundation by suitable means as the nuts 33, 34.

The threaded ends of the adjusting rods 2O are shown mounted in holes 21by means of metal bushings 35 to avoid wear.

It is thus seen that in the preferred form the mechanism consists of aframe, supported at one end by a shaft 4 and bearings 9, and at theother end by a coil spring 31, and the frame is preferably vibrated bymeans of a weight/edler unbalanced, beltdriven ulley located above thecoil spring. The pullley Vmay be keyed to a shaft revolving in bearingsattached to the frame work, or it may revolve yon a shaft fastenedrigidly to the frame. The number of vibrations per minute of the framevaries directly as the speed of the pulley.4

The centrifugal of the weight 11 on the pulley 10 causes an unbalancedradial pull away from the axis of the pulley that implarts a vibrationto the frame; since the ame work 'at the opposite end from Vthe pulleyis rigidly attached to the shaft 4 supported by bearings 9, theresultant motion produced by revolving the weighted pulley, is in theare of a circle. n other words the pulley end of the frame can onlytravel on the circumference of a 'circle whose center is the center. ofthe shaft 4 at the bearing end.

Medea@ by the rod 28 anchored to a foundation and passing through thespring and through a yoke resting on the springand rigidly attached tothe frame work, and the tension on the spring is preferably regulated bythe nut 30 on the upper end of the rod; said nut also acting as a bumperon the up- .ward stroke of .the frame.

The ei'ect of stopping the screen with a, bump, on the upward stroke ofthe frame is to allow the material being screened to jump away from thewire cloth for an instant; thus to free the wire cloth from anyparticles tending to clog it. The sharpness of the bump is regulated bythe tension of the spring.

The screen frame is'attached to' the vibrating frame by means of setscrews passing through clamps rigidly attached to the sides of thevibrating frame so as to securely hold the same, and yet allow quickchange of screens as shown.

The screen frame is constructed so as to support the wire cloth or'other screening material in such a manner' that the cloth is heldfirmly in position and remains taut.

The rotor shownis in the form of a pulley having a long hub 37journalled on the shaft 6 and held in place by the collars 38 fixed tosaid shaft by the set screws 39.

1 claim:

l. A screen comprising a frame with a bump at the end of the relievingmovement; rails supported by said frame, each having a longitudinalgroove upon its top surface; transverse rods upon which the rails aremounted in a laterally adjustable relation to each other; a screensurface extending across the space between the rails and crimped intothe longitudinal grooves; clinchers on the screen surface to compress itinto said grooves; means fixed to the top' of the rails 'to hold theclinehers in place to secure the screen surface to the rails; andautomatic resilient means to normally spread the rails apart.

'2. A screen comprising a frame; rails supported by said frame, eachhaving a' longitudinal cove upon its top surface; transverse ro uponwhich the rails are mounted in a. laterally adjustable relation to eachother; a screen surface extendin across the space between the rails ancrimped into the longitudinal grooves;

elinchers on the screen surface to compress lit into said grooves; angleirons ii'xed to and adapted to oscillate; a pillar mounted on saidsupport and extending toward the frame; a Spring carried by the pillarand resiliently supporting the frame at a distancc'fronrthe pivot; abumper mounted on said pillar to stop the frame' on itsupwardfmovement.;and anunba'lanced rotor connected to the frame to vibrate it on its axisof oscillation.

- 4. The combination With-a frame pivoted at one end and provided at theother end with a yoke; of a pillar extending through the yoke; ay springcarried by the pillar and adapted to resiliently support the yoke; abumper carried by the. pillar and adapted to stop the yoke atthe' end ofthe upward travel; and'an 'unbalanced rotor on the frame. l'

5. The combination with la screen pivotally mountedI at one end, of aspring arranged to normally -hold the screen aslant,

A a cushion stop to limit the upward movement of the upper end of thescreen; and an unbalanced rotor operable to vibrate the upper end of thescreen to move the same away from and toward the stop.

6. In a screening apparatus comprising a frame pivotally mounted at one.end and provided with a yoke at the other end, and being adapted tosupport a screen; a pill-.1r

extending through the yoke; av spring arranged to normally hold theframe aslant; al stop on said pillar adapted to engage said yoke; and anunbalanced rotor mounted on said frame above. said spring to vibrate theupper end of the screen to move the same away from and toward the stop.

7. In 'a screening apparatus comprising a frame pivotally mounted at'one end and provided with a yoke at the other end, and being adapted tosupport a screen; a pillar extending through the oke; a sprin arrangedto normall hold the frame as ant; a stop on said pil ar; a cushioninterposed between said stop and said yoke; and an unbalanced rotormounted on said frame above said spring to vibrate theupper end of thescreen to move the same away from and toward the stop.

8. A screening apparatus comprising a. frame pivotally and resilientlymountedon the support and provided with side and cross members; bracketsfixed to and extending upward from said side members; ascreen havingside rails adjustable toward and from ea'ch other; screen materialconnecting said side members; means on said brackets adapted to fix theside -rails of the screen to the side members of the frame; and means tovibrate said frame and screen forthe purpose set forth.

9. In a screening apparatus comprising a Jframe pivotally mounted at oneend and provided with a yoke at the other end, and being adapted tosupport a screen; a pillar extending through the yoke; a sprin arrangedto normally hold the frame as ant; and a. stop on said pillar adapted toengage said yoke; and means to adjust the tension of the spring.

In testimony whereof I have hereunto California, this y set my hand atLos Angeles, 28th day of January, 1921.

. TIMOTHY D. WALSH.

lVitness:

J AMES R. TowNsENn.

